Bathtub spa



FIG. 1 is a perspective view of a bathtub spa showing our new design;

FIG. 2 is a top view of the bathtub spa of FIG. 1;

FIG. 3 is a front view of the bathtub spa of FIG. 1;

FIG. 4 is a first side view of the bathtub spa of FIG. 1;

FIG. 5 is a second side view, opposite the first side, of the bathtub spa of FIG. 1;

FIG. 6 is a rear view of the bathtub spa of FIG. 1;

FIG. 7 is a bottom view of the bathtub spa of FIG. 1;

FIG. 8 is a first side view of the bathtub spa of FIG. 1 with the housing extended; and,

FIG. 9 is a first side view of the bathtub spa of FIG. 1 with the support arm folded.

The broken lines of FIGS. 1 through 9 showing the suction cups, water inlet vents, socket, and switch are used for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a bathtub spa, as shown and described. 